close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2408956

код для вставки
Oct. 8,_ 19460
'
‘
w. A.‘ RAY
I
FUEL
SUPPLY
‘
SYSTEM
-‘ 2,408,954
'
Filed June 8', 1944
2 sheets?snee't 1
.lggez
lufomafl'c
SWIM 7
2
.
.
'
Exusm
P/wfo fube%$
.
Mice
‘7
\
ENVENTQQ
'
myl/a
Fay
<
BYMM .
ATTORNEY
-
w. s, 1946.
w. A. RAY
12,408,954‘
FUEL SUPPLY SYSTEM
~ Filed Juné 8-, 1944
2 Sheets-Sheet 2
HNVENTOR
,Wllx'am Aiay
Bv%fé
H, i
A'rrogusvg
,
2,408,954
Patented Oct. 8, 1946
UNl-TE'D‘ISTATES PATEpN-TOFFICE William A. Ray, Glendale,’ Calif., assignor to.
General Controls Coma corporation
Application June 8, 1944, smelled-539,377
9 Claims. (o1.15s_'111.1)‘
.
1
i
Since almost allsources of commercial power are
ignited fuel.
This application is a continuation in part of
5
my application ?led on January 1, 1944, under
Serial No. 516,733.
r
'
2
v__'I’l'1is system requires a source of unidirectional
current for the operation of the reset valve.
This invention relates to a system for supply
ing fuel to a burner, and more particularly to a
safety system ensuring against escape of un
alternating current, a recti?er must bev provided.
In addition, a safety control device is provided to
respond to an unsafe condition, such as an ex
tinguished burner ?ame.
I
'
It is another, object. of this invention to com
bine‘ the’ function 'of 3the'recti?erand the safety
Inthat prior application, a fluid fuel control
system is described that ensures automatic inter
ruptionrin the supply of fuel in response to the
control device;_-and more particularly by vusing
an electronic emission device that responds to
occurrence of a condition that would render the
tem are either directly or indirectly energized by
theexistence of a, pilot ?ame and'thatalso acts
as a-recti?er for theisupply of unidirectional cur
a commercial source of electrical energy.
rent to the reset valve.
system unsafe. The main elements of the sys
As an
'
.
H
.
It is still another object‘ of this invention to
example, the system may be caused to respond 15
effect, a further simpli?cation by operation of
to the extinguishment of a pilot?ame, to de
the main valve by unidirectional current derived
energize an electromagnetically operated valve.
fromthe electronic emission device. This is ren
Although systems of this general character are
dered possible ‘by the use of an electronic emis
now well-known, they suffer from the disadvan
tags that when there has been a power failure 20 sion tube that canpass power sui?cient to op
erate an appropriately designed electromagneti
from the commercial source, the mere resump
cally operated valve. ,
_
l
,
_.
.
tion of the supply of power is insu?icientto place
I For example, a type Of tube that can be effec:
the system into operative condition. It isneces
tively used for thispurpose isa multiplier photo
sary in such systems, to resetl'a valve manually,
25
tube. This tube is arranged to be energized ‘by
siderable portion of a community, the process of
resetting all of the valves involves a considerable
expense and time. In saidv prior application, this
dif?culty is overcome, it being unnecessary to
reset any of the valves, and the system im-' 30
mediately resumes operation upon re-establish
a commercial source, of alternating current, and
and where the power failure extends over a con
ment of the power,
Y
.
.
.
.
It is one of the objects of this invention to im
prove the system described in said prior appli
cation.
'
.
.
,
,
the output of the tube is unidirectional. The cur
rent ?ow depends upon the intensity» of illumina
tion ofvthe photosensitive cathode. Thisinten
sity in turn is dependent upon the illumination
created by the pilot flame, _
, 7
.
It is still another object of this invention ef-_
fectivelyto utilize such a phototube, both as a
control device and as a source of unidirectional
current for supplying power to the system.
__'_I?his invention possesses many other, advan
In the system described in said prior applica
tion, the controlling valve requiring resetting,
and operated electromagnetically, is maintained
tages, and hasother objects which may be made
open even upon power failure; and yet is closed
in response to an unsafe condition. This is ace
purpose there are shown a few forms ‘in the
more clearly apparent‘from a consideration of
several embodiments of the invention. For. this
drawings accompanying and forming part of. the
complished'?rst, by providing a direct current
present specification. These forms will now be
electromagnet that has su?icient remanence. to
described in detail, illustrating the general prin
keep its'armature or core in attracted position
ciples of the invention; but it is to beunderstood
even when ole-energized; and, second, by utilizing
the power to provide an alternating de-magnetiz 45 that this detailed description is not to be taken
in a limiting sense, since the scope. of they inven
ing flux for the electromagnet. Normally, there
tionis best de?ned by the appended claims. .
fore, the remanence is neutralized and the elec
Referring to the drawings:
I ,
tromagnetically operated valve responds to any
Figure 1 is a diagrammatic view of’ a system
control condition requiring it to close. But on
power failure, the de-magnetizing force is ab— 50
Fig. 2 is awiring diagram of the system; and.
sent, and the remanence is then effective to keep
Fig. 3 is a‘ wiring diagram of a slightly modi?ed,
the reset valve open. This'open condition is not
incorporating the invention;
dangeroussince thepower failure causes an
other electromagnetically operated valve to close, -
thus interrupting the ?ow of vfuel.
form of the system.
,
v
v
a
.
,
,
_
I.
,
‘
.
Thesystem may be utilized for the control of
fuel generally, such ‘as liquid or gaseous fuels.‘
2,408,954
3
4
In the present instance a main burner I, adapted
for gas fuel, is illustrated in Fig. 1. It is supplied
In order that the phototube 8 transmit a sum
cient current for the operation of valve 3, it is
shown as of the multiplier type. One such tube
is known as the 931-A. It includes a photo
sensitive cathode I8 which emits electrons when
its active surface is illuminated, as by the ?ame
5. The anode I9 ?nally receives the electrons
produced in the tube by successive action of the
electrons upon a number of auxiliary electrodes
from an appropriate source of fuel supply, as
through the pipe 2. The ?ow of fuel to the burn
er is controlled by a main fuel valve 3, shown
also in Figs. 2 and 3. A pilot burner 4 provides a
?ame 5 for igniting the burner I when valve 3
is opened. This pilot burner 4 is shown as sup
plied through conduit 6 leading to the pipe 2 and
arranged back of the valve 3, so that closure of 10 or secondary emitters 20, 2I. 22, 23, 24, 25, 26,
valve 3 will not serve to shut off the supply of
21, and 28. In the present instance, nine such
fuel to the pilot burner 4. The conduit 6 is shown
auxiliary electrodes are shown. In order that
as including a pilot burner valve ‘I, shown also-in
these electrodes serve effectively to reinforce the
Figs. 2 and 3.
-
-
I
Both of the valves 3 and ‘I are shown as'elec
15
original electronic stream emanating from the
cathode I8 by secondary emission, they are shown
trically operated. Furthermore, the control is
as connected by taps to the high voltage sec
ondary coil 29 of a step-up transformer 30. The
such as extinguishing of pilot ?ame 5, both valves ‘
primary coil 3| may be connected to a commer
cial source of alternating current.
are caused to close. After the pilot valve 1 is
closed, the arrangement is such that it will not 20
The operation of such a multiplier tube is well
re-open by mere re-establishment of the safe con
known. A relatively weak stream of electrons
is dislodged from the photo-sensitive surface of
dition, but mustbe held open until the burner 4
is lighted and the ?ame 5 is re-established.
cathode I8. This stream is greatly reinforced
The safety control circuit includes a light-sen
by secondary emission successively from the aux
sitive device, such as a phototube 8. that re
iliary electrodes 2!) to 28 inclusive the active sur
such that, in the event of an unsafe condition,
sponds to the light produced by the pilot flame
5, to the substantial exclusion of any other light
source, as by the aid of appropriate shields. A
focussing device .9 may be used to project the
light from ?ame 5 onto the light-sensitive elec 30
faces of which are successively encountered by
the electron stream. The output current be
tween the anode I9 and cathode I8 is unidirec
tional.
The main valve 3 is diagrammatically illus
Thus, for the operation of the electromagnet
I2, the anode I9 is connected as by conductor
32 with the electromagnet I2. The other ter
_ trated in section in Fig. 2. It is shown as includ
ing a stem I 0 carrying a magnetic member or ar
minal of electromagnet I2 is shown as connected
by connection 33 to an automatic switch 34
trode of tube 8.
.
mature II. An electromagnet structure I2 serves
to exert a pull upwardly upon the armature I I to
open the valve 3 when the electromagnet I2 is
su?iciently energized.
' which may be a. thermostat or other condition
responsive device. Thence, the current flows
through connection 35 to the upper terminal of
secondary coil 29. From the lower terminal of
Preferably this valve
structure is such that a relatively small current
of the order of one watt is sufficient to lift the
armature I I for opening the valve,
secondary coil 29, connection 36 leads to the
cathode I8. The alternating current electro
motive force across the terminals of secondary
.
Substantially the same type of structure is uti
lized for the pilot burner valve ‘I. In this case
the electromagnet associated with the valve in
cludes a pair of coils I4 and I5 wound upon a
u
magnetic core I6. The. arrangement is such that,
coil 29 is recti?ed through the unidirectional ?ow
of electrons between the cathode I8 and the an
ode I9. The electromagnet I2 is connected to
receive this recti?ed current, by the aid of the
circuit iust traced.
once the armature I3 is released from the core
This circuit is de-energized as soon as cathode
I6, re-energization of the electromagnet does not
cause lifting of the armature I3; instead, it must
be urged upwardly toward the poles of the core
It by the manual reset button I‘I.. Accordingly,
once the. ?ow of fuel to the pilot burner 4 is in
terrupted by valve 1, such ?ow cannot be re
established until the button I‘! lifts the armature
I8 ceases to be illuminated by the pilot ?ame
5, and then valve 3 closes.’ However, upon re
establishment of ?ame 15, the electronic emission
current passing through tube 8 is sumci'ent to
re~energize the electrpmagnet I2, provided the
automatic switch device 34 is closed.
As heretofore stated, the pilot burner valve ‘I
is arranged to close when there is a failure of
the ?ame 5. However, it is arranged to be vleft
50
I 3 into the operative in?uence of magnetic mem- '
ber I5. Then while the valve ‘I is held open, the
pilot burner 4 can be ignited to re-establish the
?ame 5; and this in turn, causes operative ener
open if there is a total failure of the power sup
ply. In, order to effect this result, use is made
gization of coil I4.
of a supplemental coil I5 'on core I6. ‘Coil I4,
So long asthis ?ame 5 is in existence, the pho 60 normally energizing the electromagnet, is sup
totube 8- serves to control the circuits associ
plied with unidirectional current through the
ated with the valves 3 and ‘I, so as to maintain
phototube 8. However, it is so connected that
them in operative condition. As soon as the ?ame
the current flow is considerably less than the
5 is extinguished the phototube becomes inactive
current ?ow through the main valve electro
65 magnet I2. For this purpose, the coil I4 is con
One type of control circuit for effecting this
nected in the lead between any one of the aux
result is illustrated in Fig. 2. In this arrange
iliary electrodes 20 to 28, and a tap on the sec
ondary coil 29. In‘ the present instance ‘the coil
ment, the phototube 8 is utilized to serve also as
I4 is interposed in the lead from auxiliary elec
an electronic emission recti?er for supplying uni
directional current to the electromagnet I2 and 70 trode 28 and its corresponding tap 31.- By ap
to the coil I4 of valve ‘I. Accordingly, the photo
propriate choice of the auxiliary electrode, the
quantity of current ?ow in coil I4 can be that
tube 8 serves a plurality of functions: not only
is it a control device, but it also serves to trans
most suitable; and therefore the magnctomotive
mit recti?ed current to the system, capable of
force ‘produced by the coil I4 is su?icient to m'ain- ‘
and these valves are caused to close.
directly operating main valve 3.
tain the armature I3 in attracted position, but
4,408,954
5
its valve closing position.
T
I
w.
trolling the ?ow of ‘ fuel to'the burner,‘ a photo
.
The coil I5 is shownas directly connected-in
serieswith the primary coil 3| of transformer
30. 'This coil l5 has a magnetomotive force" just 0:
sufficient to neutralize the magnetic remanence
of core 16 when the coil 14 is de-e‘nergized. .
This remanence, by appropriate choice of ma
terial for core [3, is such that it would retain the
armature [3 in attracted position even when coil
[4' is vde-energized. . ‘Accordingly, in order that
6
burner, an electrically operated valve forYcon-'
not suincient to attract‘ the armature l3 from
electric tube having a photosensitive cathode and
adaptedto be energized from a source of alter
natingcurrent, said‘ device serving to rectify the
alternating current, and supplying the. resultant
unidirectional current to operate said valverand
alight source affecting the cathode for control
ling the ?ow of said unidirectional current, vsaid
light source being active in response to a condi
tion of operation of said system.
.
'
'
3. In a system of the character described, a
the armature l3 be released, the coil. 15 must be
energized, for neutralizing the remanence.
I
In the event of powerv failure, the coil 15 is
main burnerza pilotiburner for providing a pilot
?ame, an electrically operated valve ‘forcontrol
not energized and, therefore, the remanenceof
core I6 retains the armature 13 in attracted po
sition, if the armature happens to be in~ that
position. The necessity- of resetting each and
photo-electric tube having ‘a photosensitive cath
ode and adapted to“ be energized by a source-of
alternating current, said device serving to rectify
every one of the valves-‘such as 1, that'are in
stalled in a district where ‘the power failure oc
ling the ?ow 'offuelwtothe main burner, and a
theialternating current, and ‘supplying the rre- .
20 sultant unidirectional current to ' operate ‘ said
valve, the ?ame of the pilot burner supplying
illumination for the cathode, to causean'oper
ating unidirectional current to?ow- for electri'
curred is avoided. 'Nevertheless,'it is ensured
that valve 3 closes when the‘ power goes off, for
electromagnet I2 is then de-energized.
' Normally, without any power failure, the pilot
cally
.4. In
operating
a' system
the of
valve.
thecharacter
"
. described,‘
i’ . ~ "
a
burner valve 1 is maintained open only 'while
?ame 5 is in existence. As soon as ?ame 5 is
main burner,’ a pllotburner for producing a pilot
?ame, an electrically operated valve for control
ling theflow of fuel to. the main'b-urner, an elec
extinguished, the phototube 8 becomes inactive.
The electromagnet i2 is also de-energized, en
suring closing of ‘the valve 3; and, at the same
time, core I6 releases armature [3, thereby caus
ing the closing of valve'l. The coil 15 acts to
trically operated valve forthe, pilot burner, hav
30 ing a magnetic member and a coil for-magnetiz
ing said member, an electronic emission. device,
adapted to be energized‘ from a source of alter
neutralize the remanence of core I6, ensuring
nating_current,'said device serving to-rectify the
alternating current, and-supplying the resultant
unidirectional current-‘to; operate both of said
release of armature I3. Thetunsafe condition
created by the extinguishing of ?ame 5 thus sets
into operation the safeguardsthat ensure against
any ?ow of unignited fuel.
valves, said electronic emission device including
meanscausing?ow of saidunidirectional current
of sufficient quantity to operate said main valve,
only while the pilot ?ame is in existence, said de
respond to the temperature of the space to be
heated. The valve 3 may be operated thereby to 40 vice also supplying'unidirectional currentto the
pilot burner valve coilfor holding the pilot burner
open and close, as required by temperature con
Valve 3 is independentlycontrollable by the
automatic switch or thermostat 34, which may
valve, open, the remanence of the magnetic mem
ditions.
.
‘
ber being suf?cient to retain the pilot burner
In the form illustrated in Fig. 2, the coil 14 is
valve‘ open after the coil is de-energized, and a
provided with unidirectional current of appropri
ate potential di?'erence below the potential dif
ference applied to the electromagnet I 2. This
is accomplished, as heretofore stated, by inter
posing the coil M in the lead between one of the
auxiliary electrodes and the secondary coil 29.
In the form illustrated in Fig. 3, the system
operates substantially identically with that illus
trated in Fig. 2, except that the reduced poten
tial diiference of coil I4 is obtained in a slightly
di?erent way. In this form of the invention the
electromagnet I2 is supplied, as before, with uni
directional current as by appropriate connections
32, 33 and 35, as in-the form illustrated in Fig.
2. The coil 14 is placed in parallel with the
electromagnet I2; and a resistance 38 included
in the circuit of coil M to reduce the potential
difference across the coil.
The inventor claims:
1. In a system of the character described, a
burner, an electrically operated valve for con
trolling the ?ow of fuel to the burner, a photo
electric tube having a photosensitive cathode
and adapted to be energized from a source of a1
demagnetizing coil for the magnetic member and
supplied from the source of alternating current,
said demagnetizing coil operating to render said
remanence ineffective while the source of alter
nating current is active.
50
5. In a system of the character described, a
main burner, a pilot burner for producing a pilot
?ame, an electrically operated valve for control
ling the ?ow of fuel to the main burner, an elec
trically operated valve for the pilot burner, hav
ing a magnetic member and a coil for magnetiz
ing said member, a photo-electric tube having a
photosensitive cathode and aifected by the pilot ’
?ame, said tube being adapted to be energized
from a source of alternating current, for supply
ing unidirectional current to operate the main
valve only‘ while the pilot ?ame is in existence,
said device also supplying unidirectional current
to the pilot burner valve coil for holding the pilot
burner valve open, the remanence of the mag
netic member being sufficient to retain the pilot
burner valve open after the coil is de-energized,
and a demagnetizing coil for the magnetic member and supplied from the source of alternating
current, said demagnetizing coil operating to
ternating current, said device serving to rectify
render
said remanence ineffective while the
the alternating current, and supplying the re 70
source
of
alternating current is active.
sultant unidirectional current to operate said
valve, and a light source a?ecting the cathode
for controlling the ?ow of said unidirectional
current.
2. In a system of the character described, a
6. In a system of the character described, a
main burner, a pilot burner for producing a-pilot
?ame, an electrically operated valve for control
ling the ?ow of fuel to the main burner, an elec
2,408,954
trically operated valve for the pilot burner, hav
ing a magnetic member and a coil for magnetiz
ing-saidmember, a multiplier photo-electric tube
having a photosensitive cathode, an anode and
intermediate electrodes, said cathode being af
fected ‘by the pilot ?ame, said tube being adapted
to bev energized from a source of alternating cur
8
magnetizing said member; an electronic emission
device, adapted to be energized from a source of
alternating current, for supplying unidirectional
current to both of said circuits, said device in
cluding means causing ?ow of said unidirectional
current of su?icient quantity to operate said main
valve only while the pilot ?ame is in existence,
the remanence of the magnetic member being
su?icient to retain the pilot burner valve open
10 after the coil is de-energized, a demagnetizing
coil for the magnetic member and supplied from
while the pilot flame is in existence, the coil for
the source of alternating current, said demagnet
the pilot burner valve being supplied with uni
izing coil operating to render said remanence in
rent, the intermediate electrodes being connected
to the source and having progressively higher
electromotive forces, said tube supplying uni
directional current to operate the main valve only
directional current derived from 'one of said in
termediate electrodes, to hold the pilot burner
valve open, the remanence of the magnetic mem
effective while the source of alternating current
is active, and condition responsive means for in—
dependently controlling the circuit for the main
ber being sufficient to retain the pilot burner
valve open after the coil is'de-energized, and a
demagnetizing coil for the magnetic member
9. In a system of the character described, a
main burner, a pilot'burner for producing a pilot
supplied from the source of alternating current, -
?ame,>a main valve'for controlling the ?ow ‘of
said demagnetizing coil operating to render said
remanence ineffective while the source of alter
nating current is active.
7. In a system of the character described, a
burner, a valve for controlling the ?ow of fuel
to the burner, an electric circuit controlling the
operation of the valve, a photo-electric tube hav
ing a photosensitive cathode and adapted to be
energized from: a source of alternating current,
said device serving to rectify the alternating cur 30
rent, and supplying the resultant unidirectional
current to operate said valve, a light source af
fecting the cathode for controlling the flow of
said unidirectional current, and condition re
valve._
.
fuel to the main burner, a circuit for operating
the main valve, a valve for the pilot burner, a
circuit; for operating the pilot burner valve, said
pilot burner having a magnetic member, said
pilot burner valve including a coil for magnetiz
ing said member, a photo-electric tube having 'a
photosensitive cathode and affected by the pilot
?ame, said tube being adapted to be energized
from a source of alternating current, for supply
ing unidirectional current to operate the main
valve only while the pilot ?ame is in existence,
said device also supplying unidirectional current
to the pilot burner valve coil for holding the pilot
burner valve open, the remanence of the mag
sponsive means for independently controlling 35 netic member being su?icient to retain the pilot
said circuit.
'
burner valve open after the coil is de-energized,
8. In a system of the character described, a
main burner, a pilot burner for producing a pilot
a demagnetizing coil for the magnetic member
and supplied from the source of alternating cur
?ame, a main valve for controlling the ?ow of
rent, said demagnetizing coil operating to render
fuel to the main burner, a circuit for operating 40 said remanence ineifective while the source of
the main valve, a valve for the pilot burner, a
alternating current is active, and condition re
circuit for operating the pilot burner valve, said
sponsive means for independently controlling ‘the
pilot burner having a magnetic member, said
circuit for the main valve.
pilot burner valve circuit including a coil for
WILLIAM A. RAY.
Документ
Категория
Без категории
Просмотров
0
Размер файла
684 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа